I'm curious. Why do you side with the states? Is it The Constitution, or something else?
It's a combination of three factors:
1. The Constitution
2. My firm belief that no morality is universally correct.
3. My belief that the government was set up in such a way that the highest level of authority over the people should be local authority, where they have a more immediate ability to exact change if they feel the laws are unjust. Then the heirarchal power decreases as the proximity decreases. this is evidenced by teh fact that at best, a person in Illinois can only directly vote for 3 out of 535 people in the federal government.
Whereas, they have far more representatives that tehy can vote for at the various local leves of city, county and state. IMO, this means that the people have a clear advantage of making their voices heard legitimately at teh local and state levels. Whereas they are but a drop in a vast ocean at the federal level.
If someone wants to live in a dry county, for example, they should have the right to do so. If someone wants to live in a county that has a ban on abortion because they feel it is morally deplorable, they should also have that right. Just because I disagree on teh morality of the issue does not make me "right" about that. It is just what is right for me.
I think that evolution is the driving force behind morality, an that this morality relates to kinship. As a species, we are designed to be in smaller more compatible groups to increase the liklihood of passing on similar genetic material. Those wh are abhorent in views and such may not be compatible with teh gorup and they might cause internal strife within said group, thus decreasing the chances of the overall group of passing on genetic material.
I think this means that there is no true universal morality that can be applied equally throughout any larger group, since smaller groups are the only one's that can avoid serious strife.
While I believe that my moral worldview is correct, I only see it as such for me and my local "group". I do not think I have the right to remove choices form those who disagree except if they choose to remian in the group to which I belong.
I don't disagree with enforcing your morality on others, I disagree with enforcing your morality on otehrs while removing their ability to choose otherwise.
I consider the ability to move elsewhere, or lobby for a change in local government as a legitimate choice which people can partake of.